Reproducing the Issue

4.Navigate to the sub-tab Project Stock Orders and expand the Project Stock Order XXX (XXX stands for Project Stock Order ID) .

5.When you select Product DEF (DEF stands for the Product ID).

You can see that the Consume button is greyed out.

Cause

The Project Stock Order is in completed status. Once it is completed, the consume button is greyed out.

Resolution

In Project Stock Order XXX, Product DEF has type "Consumption at Site". For such type, you have to bring the stock back via ad-hoc Goods Movement in Internal Logistics Work Center and then create a new Project Stock Order.